Wuppertal 2015 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 1: Erdnaher Weltraum

EP 1.6: Hauptvortrag

Montag, 9. März 2015, 15:30–16:00, G.10.02 (HS 9)

The lunar semi-diurnal tide in the terrestrial airglow — •Christian von Savigny and Olexandr Lednytskyy — Institut für Physik, Ernst-Moritz-Arndt Universität Greifswald, Greifswald, Germany

While ocean tides are a well known and well understood phenomenon, many aspects of lunar tidal signatures in the atmosphere are less well understood. Particularly in terms of lunar semi-diurnal tidal signatures in terrestrial airglow emissions the existing studies are partly contradictory and generally suffer from lack of statistical significance. In this contribution we present the first - to our best knowledge - statistically significant lunar semi-diurnal tidal signatures in several parameters of the terrestrial airglow, including OI green line emission rates, OH(3-1) emission rates, as well as OH emission altitude, atomic oxygen and temperature in the MLT region. The data sets are all based on nightglow measurements with the SCIAMACHY instrument on the Envisat satellite that provided measurements from fall 2002 until spring 2012. Apart from the presence of statistically significant lunar tidal signatures in each parameter studied, we find a coherent relationship between the studied parameters suggesting that the observed signatures are to a large extent driven by vertical motions. Tidally driven downwelling, e.g., leads to downward transport of atomic oxygen and hence enhanced OI green line and OH emission rates, as well as a temperature increase due to adiabatic warming.